I do mine with Photoshop (any good paint program works) after setting up the mapping in UV mapper. I just paint over the exported map image. I gave up on 3D paint programs a while ago. Hated waiting for the screen to update and show me I painted no where close to where I thought. Probly not helping much am i? Sorry- I found those programs drove me nuts too. But sometimes I use them to mark off areas of importance to me that are hard to make out in the image UV mapper exports. You can be pretty sloppy since you're just going to paint over it) Then I open that image in a 2d paint program and get the detail done with that.